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Combat - 1962 Forgotten Front 1-1 was released on:
USA: 2 October 1962
Forgotten Remembered - 2012 Pilot 1-1 was released on:
USA: 30 November 2012
The Forgotten Door by Alexander Key was published on December 1, 1986.
The ISBN of The Secret of the Forgotten City is 0-448-09552-1.
The ISBN of Forgotten God - book - is 978-1-4347-6795-0.